CROWNPIECE

Etymology

Noun

crownpiece (plural crownpieces)

A strap in the bridle that goes over the horse's head just behind the animal's ears.

Synonyms

• headstall (US)

• headpiece (UK)

Source: Wiktionary

Crown"piece` (-ps`), n. (a) A piece or part which passes over the head, as in a bridle. (b) A coin [In sense (b) properly crown piece.] See Crown, 19.

Source: Webster’s Unabridged Dictionary 1913 Edition